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Has anyone heard or seen of a supported bluetooth headset for the 7921G phones?
This phone has a 2.5-mm (four-conductor tri-band) connector that can accommodate a Nokia-compatible headset. Please refer to http://www.plantronics.com/cisco for a list of headsets that are supported.
There is no bluetooth native to the 7921. Also as you may know, bluetooth also operates in the 2.4 GHz space, so could effect quality if using 802.11b/g.
There are some companies that make an adapter from 2.5mm headset jack to Bluetooth adapter, but have only seen the 2 band / 3 conductor type (non-Nokia compatible).
Only wired headsets from the URL provided above are supported on the 7921. There are also options from Jabra www.jabra.com as well.